[Xen-devel] [PATCH v7 7/8] xen/arm/arm64: introduce xen_arch_need_swiotlb
david.vrabel at citrix.com
Mon Nov 3 03:01:49 PST 2014
On 03/11/14 10:45, Stefano Stabellini wrote:
> On Mon, 27 Oct 2014, Stefano Stabellini wrote:
>> Introduce an arch specific function to find out whether a particular dma
>> mapping operation needs to bounce on the swiotlb buffer.
>> On ARM and ARM64, if the page involved is a foreign page and the device
>> is not coherent, we need to bounce because at unmap time we cannot
>> execute any required cache maintenance operations (we don't know how to
>> find the pfn from the mfn).
>> No change of behaviour for x86.
>> Signed-off-by: Stefano Stabellini <stefano.stabellini at eu.citrix.com>
>> Acked-by: Ian Campbell <ian.campbell at citrix.com>
> Konrad, David, are you OK with the swiotlb-xen changes?
Reviewed-by: David Vrabel <david.vrabel at citrix.com>
But swiotlb is Konrad's responsibility.
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